EP0024490B1 - Procédé pour séparer un moule à carapace réfractaire en sable aggloméré d'un modèle de fonderie - Google Patents

Procédé pour séparer un moule à carapace réfractaire en sable aggloméré d'un modèle de fonderie Download PDF

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Publication number
EP0024490B1
EP0024490B1 EP80103436A EP80103436A EP0024490B1 EP 0024490 B1 EP0024490 B1 EP 0024490B1 EP 80103436 A EP80103436 A EP 80103436A EP 80103436 A EP80103436 A EP 80103436A EP 0024490 B1 EP0024490 B1 EP 0024490B1
Authority
EP
European Patent Office
Prior art keywords
mask
separating
moulded shell
casting pattern
air pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80103436A
Other languages
German (de)
English (en)
Other versions
EP0024490A1 (fr
Inventor
Christian Schönenborn
E. Prof. Jaeger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kloeckner Humboldt Deutz AG
Original Assignee
Kloeckner Humboldt Deutz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Priority to AT80103436T priority Critical patent/ATE3005T1/de
Publication of EP0024490A1 publication Critical patent/EP0024490A1/fr
Application granted granted Critical
Publication of EP0024490B1 publication Critical patent/EP0024490B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C17/00—Moulding machines characterised by the mechanism for separating the pattern from the mould or for turning over the flask or the pattern plate

Definitions

  • the invention relates to a method for separating a refractory form mask from a foundry model, in which the form mask is covered by a fine-grained mineral mass with an organic or inorganic binder by mechanical and / or pneumatic compression and optionally by heat curing on the surface of the foundry model Particles is shown and in which an overpressure is generated between the foundry model and the mold mask.
  • a thin form mask is formed by means of a type of filtering process by means of a pressure difference between the surface and the back of a model.
  • the mold mask is separated from the model after curing by supplying compressed air from the back of the model via perforations in its surface. Due to the distribution of the perforation over the surface, when the compressed air is applied during the separation process, there is at least occasional and uneven loading of the molding mask. This is particularly the case if the perforations have clogged up during the manufacturing process and not all of them are released again uniformly by the compressed air.
  • the uneven loading of the form mask can lead to breakage in the case of brittle shells and distortion in the case of soft shells.
  • a similar process for the production of a molding mask from a dry, fine-grained mineral mass with a thermosetting, particle-enveloping binder is known, which is compressed by means of compressed air on the surface of a foundry model to form a thin molding mask. After curing, the mold mask is mechanically separated from the model surface using lifting pins. The form mask is subjected to even more stress at certain points.
  • the mold mask is separated evenly from the entire surface of the foundry model, regardless of its shape.
  • the simultaneous action of an underpressure on the top and an overpressure on the back of the molding mask results in a reliable sequence of the separation process, since the underpressure acts completely uniformly and the overpressure counteracts sticking of the molding mask and at the same time prevents the molding mask from lifting off quickly the back of which in turn creates a vacuum.
  • the stability, elasticity and porosity of the form mask can be specifically selected for further processing without any particular restrictions, with the appropriate choice of binder and material.
  • a pressure difference built up as suddenly as possible on the form mask detaches the entire form mask with absolute certainty even in the area of the finest contours.
  • the method according to the invention simplifies the separation and removal process.
  • FIG. 1 An exemplary embodiment of an apparatus for carrying out the method is shown in simplified form.
  • the figure shows a cross section through a foundry model with a molding box arranged thereon.
  • the foundry model 2 denotes a molding mask which is hardened in a corresponding shape on the surface of a foundry model 2.
  • the foundry model 2 has a space 3 on its rear side, which is connected on the one hand to a multiplicity of uniformly distributed bores 4 extending to the surface of the foundry model 2 and on the other hand to a compressed air connection 5.
  • a molding box 6 is arranged on the foundry model and surrounds the molding mask 1 in a bell-like manner. The inside of the molding box 6 is in turn connected to a vacuum connection 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Mold Materials And Core Materials (AREA)

Claims (2)

1. Procédé pour la séparation d'un masque de moulage réfractaire au feu (1) d'un modèle de coulée (2), par lequel le masque de moulage (1) est constitué par compactage mécanique et/ou pneumatique et, le cas échéant, durcissement à la chaleur, sur la surface extérieure d'un modèle de coulée (2), d'une masse minérale à fine granulation avec des particules enrobées dans un liant organique ou non organique, et par production d'une surpression entre le modèle (2) et le masque (1), procédé caractérisé en ce qu'on produit une dépression sur la face supérieure du masque de moulage (1).
2. Procédé suivant la revendication 1, caractérisé en ce que la dépression sur la surface supérieure du masque de moulage (1) est produite par à-coups.
EP80103436A 1979-07-20 1980-06-20 Procédé pour séparer un moule à carapace réfractaire en sable aggloméré d'un modèle de fonderie Expired EP0024490B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80103436T ATE3005T1 (de) 1979-07-20 1980-06-20 Verfahren zum trennen einer feuerfesten formmaske von einem giessereimodell.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2929397A DE2929397C2 (de) 1979-07-20 1979-07-20 Verfahren zum Trennen einer feuerfesten Formmaske von einem Gießereimodell
DE2929397 1979-07-20

Publications (2)

Publication Number Publication Date
EP0024490A1 EP0024490A1 (fr) 1981-03-11
EP0024490B1 true EP0024490B1 (fr) 1983-04-13

Family

ID=6076267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103436A Expired EP0024490B1 (fr) 1979-07-20 1980-06-20 Procédé pour séparer un moule à carapace réfractaire en sable aggloméré d'un modèle de fonderie

Country Status (3)

Country Link
EP (1) EP0024490B1 (fr)
AT (1) ATE3005T1 (fr)
DE (1) DE2929397C2 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765506A (en) * 1952-02-21 1956-10-09 Mechanical Handling Sys Inc Drum type machine for forming shell molds
GB821611A (en) * 1955-02-22 1959-10-14 Polygram Casting Co Ltd Improvements in or relating to methods of making shell moulds
DE1558153A1 (de) * 1963-06-06 1970-03-19 Vni I Pt I Ugolnowo Mash Selbsttaetige Vorrichtung zum Abbeben und Zusammenstellen gepresster,fertiger oberer und unterer Formmaskenhaelften
US3424229A (en) * 1966-02-22 1969-01-28 Dansk Ind Syndikat Core insertion unit for casting moulds
GB1151237A (en) * 1966-07-20 1969-05-07 Barnett Levy Method for Removing Sand Cores and Pattern Shells from Core Boxes and Patterns
US3645320A (en) * 1970-07-20 1972-02-29 Universal Refractories Corp Apparatus for vacuum forming hot top bottom rings
US3989089A (en) * 1973-09-21 1976-11-02 Hitachi Metals, Ltd. Hollow core molding device for use in shell mold
DE2608740C2 (de) * 1976-03-03 1978-05-11 Eugen Dipl.-Ing. 8871 Burtenbach Buehler Verfahren zum Verdichten von Formsand
JPS5419422A (en) * 1977-07-13 1979-02-14 Mitsubishi Heavy Ind Ltd Casting method using reduceddpressure mold having blind feeder
JPS5456931A (en) * 1977-10-14 1979-05-08 Nippon Musical Instruments Mfg Vacuum molding and casting method for casting element
DE2923044C2 (de) * 1979-06-07 1987-05-27 Eugen Dipl.-Ing. 8877 Burtenbach Bühler Verfahren und Vorrichtung zur Herstellung von geteilten Komposit-Sandblock-Gießformen

Also Published As

Publication number Publication date
EP0024490A1 (fr) 1981-03-11
DE2929397C2 (de) 1985-08-08
ATE3005T1 (de) 1983-04-15
DE2929397A1 (de) 1981-02-05

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